using System;

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                    public class Program

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{

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    public static void Main(string[] args)

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    {

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        int assignment,activity,project,exam, avg = 0;

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        string grade;

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        Console.WriteLine("student marks calculations");

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        Console.Write("enter total Assignment: ");

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        assignment = Convert.ToInt32(Console.ReadLine());

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        Console.Write("enter total activity: ");

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        activity = Convert.ToInt32(Console.ReadLine());

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        Console.Write("enter total project: ");

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        project = Convert.ToInt32(Console.ReadLine());

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        Console.Write("enter total exam: ");

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        exam = Convert.ToInt32(Console.ReadLine());

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        if (assignment > 100 || activity > 100 || project > 100 || exam > 100)grade = "error";

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        else if (assignment < 0 || activity < 0 || project < 0 || exam < 0) grade = "error";

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        else 

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        {

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            avg = (assignment + activity + project + exam) / 4;

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            if (avg > 100) grade = "error";

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            else if (avg < 0) grade = "error";

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            else if (avg >= 96) grade = "outstanding";

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            else if (avg >= 89) grade = "excellent";

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            else if (avg >= 83) grade = "very good";

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            else if (avg >= 79) grade = "good";

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            else if (avg >= 76) grade = "fair";

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            else if (avg == 75) grade = "passed";

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            else grade = "failed";

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        }

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        System.Console.Write("{0}\t{1}\t\n", "grade" , "remarks");

        System.Console.Write("{0}\t{1}\t\n", avg , grade);

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        Console.ReadLine();

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    }

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}